scholarly journals The Redundancy Technology of Measurement and Control Function of the Smart Substation

Author(s):  
Zhen YANG ◽  
Yan-ru ZHAO ◽  
Jun-peng HU ◽  
Hong-bing SHEN ◽  
Ji-feng WEN
2021 ◽  
Vol 236 ◽  
pp. 04019
Author(s):  
Hao Yuan ◽  
Min Chen ◽  
Gang Qu ◽  
Zhiyuan Gao ◽  
Yutao Qiu

This paper introduces the overseas smart substation technology scheme, describes the communication network architecture and equipment redundancy configuration in the typical overseas test smart substation scheme, and compares the similarities and differences between China’s smart substation redundancy configuration technology and the overseas smart substation configuration technology. The distribution of measurement and control functions of overseas smart substations that are different from China’s designs are explained in detail. The different architectures of overseas smart substations and China’s smart substations are illustrated. Finally, the suggestions of overseas Smart Substation and China’s smart substation are summarized.


2017 ◽  
Vol 5 (1) ◽  
pp. 18-19
Author(s):  
Rafael Heinzelmann

Performance measurement is understood as a corner stone of organizations’ accounting and control function (Chenhall,2003; Merchant & Van der Stede, 2012). In the wake of the relevance lost debate accounting systems have beencriticized for being obsessed with historical financial accounting information making accounting data inadequate fordecision making and insufficiently useful for creating a future alertness in organizations (Johnson & Kaplan, 1987). Inthe aftermath of this, more strategically-oriented accounting systems fostering on the non-financial dimension ofperformance, as most prominently presented by the balanced scorecard, gained increasingly attention by organizationsand accounting scholars (Ax & Bjørnenak, 2005; Nørreklit, 2000, 2003). Yet, there is a substantial body of researchstudying the adoption of MAIs (Management Accounting Innovations) addressing questions of how MAIs such as theBalanced Scorecard travel and change in the course of diffusion and organizational implementation (e.g. Ax &Bjørnenak, 2005; Jones & Dugdale, 2002; Qu & Cooper, 2011). What the literature does not reveal in depth is how dointegrated systems for performance measurement and control comprising financial and non-financial KPIs supportorganizations in handling uncertainty and complexity (Chenhall & Moers, 2015). In this paper, we aim for exploringperformance measurement and control and thus contributing to existing literature by studying how venture capital firmsmobilize ideas of performance measurement and control to handle uncertainty and complexity in their investmentportfolio. More specifically, we investigate two firms of the venture capital industry that use financial and non-financialindicators to manage their portfolio and make decisions. Consequently, this paper addresses the following researchquestions: How do venture capital firms use performance measurement to manage their investment portfolios? And howis “performance” constructed in this context?Exploring how firms from a quite volatile industry use performance measurement is regarded to be interestingfrom various perspectives: First of all, we know little about the link between uncertainty and performance measurement.Second from a theoretical perspective of ActorReality Construction (ARC) there is little empirical evidence on howorganizations construct facts or the factual dimension of accounting and management – facts in the context of ourempirical setting, the venture capital industry, are measures used in the performance measurement system (PMS).Particularly, venture capital firms having a big stake in early phase seed investments, are uncertain in the sense thatattaching a score or a number to a performance dimension of a portfolio company is maybe not that stable over time andambiguous. However, doing the exercise of reviewing each portfolio company according to a dashboard-like PMS givesthe KPIs, despite of their uncertain nature, a factual character. The PMS numbers allow managers to discuss andevaluate “performance” of the portfolio companies in management meetings as well as to make decisions, on forexample, investing additional money, based on the performance facts of the portfolio company. Interestingly, thecombination of “hard” and “soft” numbers – thus, financial and non-financial indicators, plays a pivotal role for VCcompanies in order to be capable to assess “the performance” of the portfolio companies. In other words, it enablesventure capital firms to better take into account the particular organizational contexts of portfolio companies.


Author(s):  
Zhang Min ◽  
Shen Jian ◽  
Chen Li ◽  
Zhou Bin ◽  
Zhou Shao Liang ◽  
...  

2021 ◽  
Vol 104 (1) ◽  
pp. 003685042199848
Author(s):  
Weijie Wang ◽  
Xiaocen Chen ◽  
Qiang Liu ◽  
Yahong Fan

The magnetically suspended control and sense gyroscope (MSCSG) integrates spacecraft attitude measurement and control function; this paper proposes a double spherical rotor (DSR) for MSCSG. The DSR realizes the five degrees of freedom (DOFs) full active control and full channel magnetic path decoupling by the following design: the spherical axial/radial reluctance magnetic bearings are adopted to control the 3DOFs translation of rotor in the range of double spherical envelope, Lorentz force magnetic bearing (LFMB) is used to precisely drive the 2DOFs universal deflection of rotor. The optimization model is established based on the structural mechanical analysis, taking the deviation between rotor centroid and shape center as the optimization objective, choosing the first order resonance frequency, maximum equivalent stress, rigid body displacement, polar moment of inertia and inertia ratio as constraints. Then the DSR is optimized and simulated by the finite element, the MSCSG principle prototype based on DSR is successfully developed, the online dynamic balance experiment and modal test of the DSR are conducted, where the vibration amount of the DSR decreases from 20 μm before the experiment to 0.14 μm after the experiment, which decreases by 99.3%, the first test modal is 2881 Hz which is 5% different from the finite element simulation value of 3034 Hz. The results show that the DSR has the good mechanical properties and magnetic circuit decoupling characteristics.


2014 ◽  
Vol 608-609 ◽  
pp. 890-894
Author(s):  
Yu Wei Zhang

An intelligent temperature and humidity measurement and control system applied to electrical equipments is designed in this paper. Design of this system covers signal processing, temperature and humidity acquisition, display and keying circuit, alarm circuit, and output control; these five sub-modules have realized its control function together. Hardware circuit design and system software application of various modules are illustrated in detail. According to practical test, software and hardware of this controller system match each other reasonably and the measurement accuracy is high. Besides, its design, development and maintenance are quite convenient, and the human-computer interface can be operated easily.


2001 ◽  
Author(s):  
G. Mainelis ◽  
R. Gorny ◽  
K. Willeke ◽  
S. Grinshpun ◽  
T. Reponen ◽  
...  

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